document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=771758>Question 771758</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help and explain: <BR>\n" );
document.write( "x^3-4x greater than or equal to 0  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #470441 by </B><A HREF=/tutors/aboutme.mpl?userid=tommyt3rd><B>tommyt3rd(5050)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=tommyt3rd><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=tommyt3rd><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=470441\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> x^3-4x greater than or equal to 0 \r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%28x%2B2%29%28x-2%29%3E=0 ALIGN=MIDDLE  ALT=\"x%28x%2B2%29%28x-2%29%3E=0\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "has 4 intervals to be checked.<BR>\n" );
document.write( "Because we are comparing the value to 0 we only need to know what its sign will be (why?)<BR>\n" );
document.write( "on [-oo,-2] the signs are (-)(-)(-) -> (-) so false<BR>\n" );
document.write( "on [-2,0] the signs are (-)(+)(-) -> (+) so true<BR>\n" );
document.write( "on [0,2] the signs are (+)(+)(-) -> (-) so false<BR>\n" );
document.write( "on [2, oo] the signs are (+)(+)(+) -> (+) so true\r<BR>\n" );
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document.write( "solution:\r<BR>\n" );
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document.write( "[-2,0]U[2,oo]<BR>\n" );
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